Stroke order for interpolation?
So I did some digging on this topic and found the answer. As future reference for 2D animators coming into Blender like me, stroke order for interpolation is the same as stroke order for stacking purposes. I do not believe there is a guide for stroke order because it was designed under a different concept - to be able to restack strokes like one would with layers. Stroke order is designed to be able to reorganize a layer, not aid in interpolation.
While this could be a bit of a setback, it also means that you are able to pick and choose which strokes are interpolated into others via the stacking order. Bringing a stroke to the front or back of a drawing will automatically sync it with the strokes on other frames.